Datasheet

PM6644 Simplified application schematic
Doc ID 023203 Rev 1 9/35
1.5 Electrical characteristics
V
IN
=12 V, no load on REF3, EN=V
IN
, FB=VCC, R=1 MΩ between TON and VIN, T
j
=25 °C
unless otherwise specified.
Table 6. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
Switching controller output accuracy
BYP
Fixed output voltage valley
regulation
FB=VCC, no load 3.40 3.47 3.54 V
FB
Adjustable output voltage
valley regulation (FB=ADJ)
No load, BYP=3.47 V;
T
j
=0 °C - 70 °C
(1)
0.88 0.92 V
Current limit and zero crossing comparator
Valley current limit 350 380 mA
Zero crossing current
threshold
SW voltage ramp slew rate = 40
V/ms
14 22 30 mA
3.3 V voltage reference
REF3
REF3 output voltage
(VREF3 voltage)
BYP=3.47 V external voltage, no
load
3.2 3.3 3.4 V
Line regulation BYP=3.47 V to 5 V, no load 2.3 6.3 mV/V
Load regulation
BYP=3.47 V external voltage, 0
mA < lload < 2 mA
500 µV
VCC supply
VCC VCC voltage
BYP< BYP falling threshold,
V
IN
> 6
3.4 3.8 4.2 V
BYP
BYP falling threshold/
REF3 turn-off threshold
2.4 2.7 V
BYP rising threshold (i.e.
VCC=BYP)/ REF3 turn-on
threshold
2.9 3.2 V
Regulator bias currents
V
IN
V
IN
shutdown current EN=0 V 13 21 µA
V
IN
quiescent current with
BYP > BYP falling
threshold
BYP=3.47 V (not switching),
REF3@no load
26 35 µA
BYP
BYP quiescent current with
BYP > BYP falling
threshold
BYP=3.47 V (not switching),
REF3@no load
190 230
µA
Fault management
VCC VCC UVLO threshold
Rising edge of PVCC 2.7 3 V
Falling edge of PVCC 2.1 2.6 V